一种新型蜂窝纸板包边工艺及其制品性能研究

目的 为实现蜂窝纸板包边工序的机械化和自动化, 提出一种新型蜂窝纸板包边工艺, 并对其制品的侧面载荷性能, 即侧面戳穿的承载状况进行研究。方法 提出了包含压溃、 压痕、 上胶、 折边和侧面压紧等5个关键工序的新型包边工艺, 并与现有手工包边工艺生产的蜂窝纸板进行对比实验, 测试和分析了2种包边工艺生产的4种不同厚度蜂窝纸板, 在侧边受集中载荷下戳穿所需的最大载荷。结果 手工包边生产工艺的蜂窝纸板侧面受集中力时, 最大戳穿力只与包边纸的性能有关系, 蜂窝纸板厚度对其没有太大的影响; 新型包边工艺生产的蜂窝纸板在侧面受集中力时, 最大戳穿力与包边纸的性能有关, 同时蜂窝纸板厚度对其也会产生较大影响; 新型包边工艺生产的同种规格蜂窝纸板侧面戳穿所需的最大载荷大于手工包边方式生产。结论 新型包边工艺大大提高了蜂窝纸板的侧面载荷能力, 同时可实现机械化和自动化加工, 极大地提高了蜂窝纸板后道工序的生产效率和产品质量。     

西门子PLC在纸浆模制蜂窝纸板生产线上的应用

本文首先对纸浆模制和蜂窝纸板的概念进行介绍,采用西门子PLC控制器对纸浆模制蜂窝纸板的生产线进行控制,利用PLC中的PID自整定的方式达到恒负压的控制、利用昆仑通态组态软件实现对成型机的实时监控,该控制的系统在很大的程度上提高运行效率,降低了成本投入,具有较高的实际应用价值。它采用了先进的生产工艺技术,整个生产过程为全自动控制。纸浆模制蜂窝纸板生产线为集成组合方式,在耗能上也有很大的改进、并且所占的面积较小。     

纸蜂窝结构平压性能的实验研究

通过对蜂窝纸芯和纸板平压强度的测试，分析孔径比、犀度对蜂窝纸芯平压强度的影响以及纸芯和纸板平压强度的差异，探讨了生产工艺对蜂窝纸板平压强度的影响。     

新型绿色包装材料性能测试及生产设备研究

研究了新型绿色包装材料-蜂窝纸板及其生产工艺、设备,同时对蜂窝纸板的几项主要技术指标进行了测试,并对发展蜂窝纸板提出了几点建议。     

蜂窝纸板与瓦楞纸板边压强度有限元分析

将结构对纸板边压强度的影响从众多影响因素中解耦,建立了蜂窝纸板和典型瓦楞纸板的有限元模型并进行了屈曲分析,得到蜂窝纸板两个方向的边压强度和典型瓦楞纸板的边压强度.提出了利用克重材料抗压效率评价纸板抗压能力的方法,利用边压强度和纸板的定量计算了每种纸板克重材料抗压效率.分析结果表明:蜂窝纸板在两个侧向上的克重材料抗压效率均大于瓦楞纸板;蜂窝纸板不仅具有优良的平压强度,而且具有优良的边压强度.     

蜂窝纸板和蜂窝纸托盘的性能研究进展

简述了蜂窝纸板和蜂窝纸托盘的性能研究现状.通过对已有研究的分析,发现目前对于蜂窝纸板的性能研究主要集中在纸板的性能指标、静态和动态特性、理论建模和有限元建模分析等方面,而对于蜂窝纸托盘的研究主要集中在力学性能和结构优化等方面.但已有研究缺乏从现实环境考虑的一些动力学方面影响因素的测试和分析,为提高蜂窝纸板和蜂窝纸托盘的实际应用,这将是以后对蜂窝纸板和蜂窝纸托盘研究的重点和难点.     

新型绿色瓦楞蜂窝复合纸板力学性能数值模拟分析

对瓦楞蜂窝复合纸板与蜂窝纸板的边压强度及抗弯强度进行比较。利用有限元仿真技术严格控制两种纸板的材质、材料用量及尺寸均相同,将结构对两种纸板边压强度及抗弯强度的影响从众多影响因素中解耦,建立两种纸板的大尺寸数值模型试样,并采用屈曲分析方法对两种纸板的边压强度进行仿真分析,同时对比分析两种纸板的抗弯强度。分析结果表明:在材质、密度、耗材及尺寸相同的前提下,瓦楞蜂窝复合纸板的边压强度比蜂窝纸板的高出约30%;瓦楞蜂窝复合纸板的纵向及横向抗弯强度比蜂窝纸板的分别高出75%,92%,蜂窝纸板纵、横两个方向的抗弯强度基本相同。     

绿色包装引起各行业高度重视全国蜂窝纸板推广应用协作网建成

为保护生态环境,推动“以纸代木”包装的改进,促进绿色包装蜂窝纸板行业科技开发能力的提高,扩大蜂窝纸板在机械、电子、轻工、运输、外贸、军品等行业的应用范围和领域,加快蜂窝纸板生产技术的发展和产品质量的提高,全国蜂窝纸板推广应用协作网成立暨首届蜂窝纸板推...     

垂直载荷作用下蜂窝纸板的非线性屈曲分析

蜂窝纸板质轻、强度高、抗冲击性能好,广泛应用于包装物流领域,但是由于其屈曲机理非常复杂而不能准确预测其屈曲强度。借助于有限元分析软件ANSYS对垂直载荷作用下蜂窝纸板的屈曲强度进行了特征值和非线性屈曲模拟分析,并对其结果进行了对比分析。结果表明,应用ANSYS软件对蜂窝纸板进行屈曲分析是可行的。分析结果对蜂窝纸板的设计、力学性能研究与测试具有一定的参考价值;非线性屈曲分析结果的精度比特征值屈曲分析高,将两者结合使用可以有效地提高分析的效率和精度。     

蜂窝纸板侧压强度实验研究

研究了蜂窝纸板的侧压强度实验方法,实验测量与分析了温度、湿度、加载速率等因素对蜂窝纸板侧压强度的影响.研究结果表明:当温度在50℃以下时,蜂窝纸板侧压强度随着温度的升高而增大,但温度超过50℃时,蜂窝纸板的侧压强度随着温度的升高而减小;当相对湿度提高时,蜂窝纸板的侧压强度随之降低;当加载速率增大时,蜂窝纸板的侧压强度随之增大.     

杀菌技术在提升预制菜质量安全中的应用研究

目的 提高预制菜的质量与品质,促进预制菜产业进一步健康发展。方法 从预制菜生产加工链出发,梳理预制菜在原料、生产加工、包装、运输贮藏等方面存在的安全隐患及解决方法。结果 研究发现预制菜在生产、流通的各个阶段,都会受到多种细菌的污染,且这些细菌对人体的危害性不可小觑;同时,本文总结了非热杀菌技术在提升预制菜质量与品质方面的应用。结论 研究发现预制菜安全性的提高不仅依赖于对源头食材质量与品质的把控,还依赖于对杀菌技术的研究与探索,使预制菜搭配更科学,食材更新鲜,加工更精准。     

Selective laser melting raw material commoditization: impact on comparative competitiveness of additive manufacturing

The paper analyses the impact of cheaper metal powder supplies on the comparative competitiveness of additive manufacturing (AM). By utilising two case studies, we compare the economic impact of an innovative titanium extraction method on Selective Laser Melting (SLM) and conventional methods of machining and casting. A switch-over analysis identifies the production quantities above which conventional manufacturing is more cost competitive than additive manufacturing. This analysis is performed for current raw material as well as cheaper raw material supply. The results illustrate the improved comparative competitiveness of SLM as the titanium supply is commoditised and more readily available in powder form. The responsiveness of the supply chain is improved as the switch-over point between SLM and conventional methods increases. Moreover, as the raw material supply chain for titanium is transformed through the use of this novel extraction method, the manufacturing supply chain is simplified.     

Reactive sintering of manganese ferrite

The reactive sintering of manganese ferrite, i.e. the concurrence of a chemical reaction with densification during firing, has been studied using several raw materials. It was shown that the formation reaction from the raw materials is always accompanied by expansion and that such processing invariably results in a less dense end product. After calcining the powder, these phenomena did not occur. This was shown to be related to an improved initial homogeneity rather than to the degree of conversion. On the other hand, calcining increased the change of excessive grain growth, which was further influenced by the porosity, the firing temperature and the presence of impurities.     

Technologies of Vegetable Biomass, Technical Rubber, and Plastic Waste Processing

The present paper considers novel thermal technologies of vegetable biomass, technical rubber, and plastic waste processing into fuel and raw material resources on the basis of the processes of vapor thermolysis of organic materials.     

Improved rice variety adoption and farm production efficiency: Accounting for unobservable selection bias and technology gaps among smallholder farmers in Ghana

Ghana's agricultural sector is dominated by smallholder farmers who often face substantial challenges such as limited access to improved production inputs and technology, financial capital and extension services. These challenges jointly contribute to low agricultural productivity and hinder Ghana's ability to meet the rising demand for food caused by increasing population, urbanization, and changing dietary habits of consumers. Adoption of agricultural technologies and innovations has often been recognized as important pathways for ensuring smallholder farming systems transformation and improved agricultural productivity, food security, rural economic growth, and reduced poverty and vulnerability among smallholder farmers. This study examines the productivity and efficiency effects of improved rice technology adoption among 412 smallholder rice farmers in Northern Ghana. Using sample selection stochastic production frontier model, selection bias stemming from observable and unobservable farmer characteristics was accounted for because farmers self-select into adopting improved rice technologies. The results indicate that adopters are 24% more technically efficient than non-adopters. In addition, adoption of improved rice varieties is associated with about 76% increase in rice farmers’ productivity, relative to non-adoption. Moreover, IRVs adoption is positively and significantly influenced by access to irrigation, access to credit, and farmer group membership. Farm size, fertilizer, chemicals, irrigation, and soil quality are the main positive determinants of rice productivity for both adopters and non-adopters.     

基于均衡拉动的DAM产品族精益生产改善研究

针对X-DAM的生产系统,通过其物与信息流动图发现生产过程中存在的问题,依据精益生产的思想和原则,提出了基于均衡拉动的改善方法.运用生产改善实践,缩短了X-DAM的过程周期,降低了在制品库存数量,提高了设备换产效率,使得生产过程更加稳健和安定,能及时应对需求的波动.     

Development of a Structured Methodology for Knowledge Elicitation: Applications to Flexible Manufacturing Systems

While automation in the discrete parts manufacturing industry has increased productivity and improved product quality it has also significantly altered the role played by the operator of the system. The operators' role has not only become more critical to the effective functioning of the system but also causes mental overload and imposes greater demands on humans' information processing capabilities. This paper examines methods by which the mental overload experienced by operators can be alleviated while sustaining improvements in productivity and product quality. Additionally, the possibility of reducing mental overload by training and aiding the operator and effecting a more optimal allocation of function using dynamic allocation of function schemes is reviewed. It is concluded that a prerequisite to using the above methods to reduce mental overload is the ability to build appropriate decision support systems. A methodology that allows the development of such decision support systems is described and results of a study to evaluate the methodology are presented.     

产品生态设计的关键技术及方法

欧盟的EuP指令提高了机电产品的准入门槛,在欧盟范围内建立起了新的贸易壁垒,而EuP指令的核心要求就是产品生态设计。产品生态设计的关键技术包括生命周期评价、原材料选用技术、结构设计技术、生产工艺设计、绿色包装设计及绿色成本分析等。我国机电产品生产企业可通过产品结构设计、产品生态辨识、产品生态诊断、产品生态指标确定、产品生态评价等方法,达到产品生态设计的核心要求。     

激光技术在过滤器壳体制造中的研究与应用

目的 研究火箭发动机关键部件过滤器壳体的改良加工方案,以替代传统的化学铣切、手工氩弧焊等工艺,提高产品尺寸精度和生产效率。方法 改良加工方案采用激光切割、激光焊接等技术,利用激光切割精度高、成形快的优点,实现镂空区域的一次成形,避免化铣周期长、易于产生飞边且打磨困难的问题;利用激光焊接热输入量低、焊接变形少的特点,使镂空状态下单边宽度3.5 mm的筋条焊接成为可能。结果 通过设置合理的工艺参数,可以有效保证产品尺寸精度并控制焊接变形,提高生产效率。结论 使用该工艺方法已成功制备了产品,并经过了发动机试车考核。     

Production planning optimisation for composite aerospace manufacturing

Composite materials proved highly successful for aerospace applications in the last decades, but increased cost pressure forces the composite industry to become more efficient. This requires new manufacturing technologies and optimised processes as raw material costs and labour costs are basically fixed when wanting to keep production on site. Probably the most defining process for aerospace composite production is manual layup of prepreg material with subsequent curing in an autoclave. From production planning view, this combination poses the challenge of transition from discrete layup manufacturing to batch curing processing with the restriction of limited allowed storage time of the prepreg material prior to cure. In this paper, a new approach for production order optimisation at the conjunction of discrete and batch processing is presented. The APOLLO named tool is designed to decrease throughput times, streamline production and increase autoclave utilisation in the composite aerospace industry.